author(s)
Brahima Diarra, Kouadio Justin Konan, Laurince Michel Yapo and Kouassi Philippe Kouassi

abstract
This study aims to investigate macroinvertebrate communities associated with floating macrophytes of Ono lagoon (Côte d’Ivoire). Samples were monthly collected from September 2015 to August 2016. Similarly, abiotic variables (temperature, transparency, depth, conductivity, TDS, pH, dissolved oxygen, NH₄⁺, NO₃^-, NO₂^- and PO₄^3-) were measured. A total of 150 macroinvertebrates belonging to 46 families and 15 orders were identified. Specifically, 125 taxa were found on Eichhornia crassipes, 77 on Salvinia molesta and 62 on Pistia stratiotes of which 52 taxa were exclusively associated with E. crassipes, 15 with S. molesta and 7 with P. stratiotes. Libellulidae (14.39-22.42%) and Corduliidae (10.56-16.47%) exhibited the highest densities. Higher values of taxonomic richness, Shannon index and evenness were recorded for macrophytes stands with a significant difference between invasive plants (E. crassipes and S. molesta) and native plant (P. stratiotes). In flood season, E. crassipes was greatly colonised by Odonata and Arachnida and was highly correlated with dissolved oxygen, temperature, PO₄^3- and depth. The rainy season was characterised by Coleoptera, Diptera, and Gasteropoda as well as highest levels of pH and NO₃^-. This season was correlated with S. molesta and P. stratiotes. In dry season, Heteroptera, Decapoda, Lepidoptera and Epheroptera were abundant and correlated with transparency.